Violet wool-dye.



when ATES PATENT oFFroE.

PAUL THOMASCHEWSKI, 0F VOHWINKEL, NEAR ELBERFELD, GER-MANY, ASSIGNOR TO FARBENFABRIKEN VORM. FRIEDR. BAYER & (30., OF ELBERFELID, GERMANY, A

DOB-EPORATIQN OF GERMANY.

VIOLET WOOL-DYE.

No Drawing.

Specification of Letters Patent.

Application filed June 1,

Patented Sept. 26, 1911-.

1911. SeriaI'No. SE15.

SKI, doctor of philosophy, chemist, a citizen of thc German Empire, residing at Vohwinkel, near Elberfeld, Germany, have invented new and useful Improvements in Violet ool-Dye, of which the following is a specification.

My invention relates to new violet wool dyes which can be obtained by heating 1- alkylaminol arylamino ant-hraquinoncs with urea and a condensing agent.

The dyes are produced most probably in accordance with the following equation:

with sulfonating agents they are converted into the soluble sulfonic acids which are after bemg dried and pulverized 1n the shape of thelr alkaline salts violet powders soluble in water with a violet'color and dyeing wool from acid baths fast violet shades.

. In order to illustrate the new process more fully the following example is given, the parts being by Weight: 10 parts of l-methylamino 4 paratolylaminoanthraquinone, 10 parts of urea, 10 parts of ammonium chlorid and parts of phenol are boiled together until a sample is soluble in pyridin with a Violet color which is not changed to red by a further heating. 100 parts of alcohol are added and the precipitate thus obtained is filtered off and washed with alcohol and water. One part of the product thus obtained is dissolved in 10 parts of monohydrated sulfuric acid, fuming sulfuric acid is added until the mixture fumes and the melt is then heated to 50 C. until a sample is solublein water. The melt is then introduced into 100 parts of ice water, heated, filtered off, neutralized. with soda and dried. It is a violet powder being a sulfonic acid of a product having most probably the formula:

NI'LC1H1 It is soluble in water with a violet 0101' and dyes wool violet fast shades.

ll claim 1. The herein described new dyes being sulfonic acids of compounds having most probably the formula:

NH-aryl which a; 7 after being dried and pulverized in the shape of their alkaline salts violet powders soluble in water with a violet color; and dyeing wool violet fast shades, substantially as described.

sulfonic acid ofa product'having most probably the formula In testimony whereof I have hereunto set 1 my hand in the presence of two subsc lbll'lg PAUL 'IHOMASOHEWSKI.

Witnesses: i ALFRED I-IENKEL,

ALBERT F. Norma.

2. The herein described new dye being a 

